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Thermodynamic study on the interaction of imidazolium salts and POE-type nonionic surfactant in the adsorbed film

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Abstract

The composition of the adsorbed film and the excess Gibbs energy of adsorption \( {\widehat{g}}^{\mathrm{H},\mathrm{E}} \) were evaluated from thermodynamic analysis of surface tensions for the 1-decyl-3-methylimidazoulium bromide (C10mimBr)–tetraethylene glycol monooctyl ether (C8E4) and 1-decyl-3-methyl-imidazolium tetrafluorobrorate (C10mimBF4)–C8E4 systems, where the counter anion of imidazolium salts is different from each other. The higher miscibility of two components compared to an ideal mixing and thus negative \( {\widehat{g}}^{\mathrm{H},\mathrm{E}} \) were observed in the former, which comes from the ion–dipole interaction between imidazolium cation and the oxyethylene group of C8E4. On the other hand, the lower miscibility and thus positive \( {\widehat{g}}^{\mathrm{H},\mathrm{E}} \) were observed for the latter. Such differences were attributed to that BF4 − forms two hydrogen bonds and has stronger affinity with the cationic head group of C10mim+ than Br−. This results in that the ion–dipole interaction between C8E4 and C10mim+ cation is diminished in the C10mimBF4–C8E4 system.

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Authors and Affiliations

  1. Department of Chemistry, Faculty of Sciences, Kyushu University, Fukuoka, 812-8581, Japan

    Huihui Li, Yosuke Imai, Takanori Takiue, Hiroki Matsubara & Makoto Aratono

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  1. Huihui Li
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  2. Yosuke Imai
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  3. Takanori Takiue
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  4. Hiroki Matsubara
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  5. Makoto Aratono
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Correspondence to Makoto Aratono.

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Li, H., Imai, Y., Takiue, T. et al. Thermodynamic study on the interaction of imidazolium salts and POE-type nonionic surfactant in the adsorbed film. Colloid Polym Sci 292, 1209–1215 (2014). https://doi.org/10.1007/s00396-014-3172-5

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  • DOI: https://doi.org/10.1007/s00396-014-3172-5

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